Perhaps you should try some spelling variations:
bach nuoc » bach tuoc, sach nuoc, bich ngoc
hieu viec » nhieu viec, sieu viet, hieu hien
so sach » so sanh, bo sach, hoc sach
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
co sach » bo sach, cuon sach, hoc sach
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (co sach)) ty nang xa hoi. ((hieu viec) OR (hieu ve)) bach nuoc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ty nang xa hoi. ((hieu viec) OR (hieu ve)) bach nuoc va hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (co sach)) ty nang xa hoi. ((hieu viec) OR (hieu ve)) bach nuoc va hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) ty nang xa hoi. ((hieu viec) OR (hieu ve)) bach nuoc va hanh di cua tre*.